Vacuum Tube FU33 Tube Amplifier Replace 833A/C High Power Output HIFI Audio

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Vacuum Tube FU33 Tube Amplifier Replace 833A/C High Power Output HIFI Audio Model No: FU33 The FU33 electron tube is a direct-heating thorium carbide cathode glass triode, the anode cooling method is natural cooling, the maximum anode dissipation power is 350W, the maximum operating frequency is 30MHz, and the output...
$198.90
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$198.90
Important: Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).

Vacuum Tube FU33 Tube Amplifier Replace 833A/C High Power Output HIFI Audio

Model No: FU33

The FU33 electron tube is a direct-heating thorium carbide cathode glass triode, the anode cooling method is natural cooling, the maximum anode dissipation power is 350W, the maximum operating frequency is 30MHz, and the output power is 1000W.

 

It is mainly used for oscillation in industrial high-frequency heating equipment and amplification in radio equipment.

 

This tube can be used interchangeably with the 833A/C type electron tube produced in the United States.

 

 

Vacuum tube FU33 is a high-power triode, usually used in communication equipment, with the characteristics of high voltage resistance. Some data of FU33 are indeed very scary. For example, the maximum anode voltage can reach thousands of volts, the maximum anode dissipation power is about 300W, and the filament current can reach 10A, which is very harsh on power supply. It seems that using FU33 to make power amplifiers is not an easy thing, but why use it? A senior audiophile said, "This vacuum tube has good pressure resistance, good sound, strong three-dimensional sound field, strong dynamic output of Class A, and freely retractable."

 

 

Pins Diagram

Basic Parameters

 

 

Filament Voltage ……………………………………………… 10 V

Filament Current ……………………………………………… 9.4---10.6A

Inter electrode Capacitance

Grid Plate …………………………………………………… 5.5--7.1 pF

Grid Cathode ………………………………………………… 10.1—14.5 pF

Cathode Plate ………………………………………………… 6.4—10.6 pF

Amplification factor……………………………………………… 31.5-38.5

Operation Frequency …………………………………… 30MHz

Anode DC Voltage…………………………………………… 3kv

Anode DC Current ……………………………………………… 415Ma

Grid Current ……………………………………………… 40-70mA

Grid Impedance ………………………………………… 3.5/5 kΩ

Output power ……………………………………………… 1000W

Application ……………………………………………… broadcast communicate and High- frequency hearting.

Cooled style …………………………………………… wind cooled

 

 

Limit using parameter

 

 

Maximum filament voltage: 10.5V

Minimum filament voltage: 9.5V

Maximum anode DC voltage: 3300V

Maximum anode power dissipation: 350W

Maximum grid power dissipation: 20W

 

 

Mechanical Parameter:

Weight: (approximately) 0.6Kg

Installation method: vertical, anode lead up

Cooling method: natural cooling

The highest temperature of the shell: 225℃

The highest temperature at the sealing joint: 200℃

High temperature at the terminal: 200℃

 

Use requirements and precautions

 

1. When using electronic tubes, there should be no more than one limit value parameter. Exceeding the limit value is not allowed even for a very short time.

2. The lead wires connected to the electrode of the electron tube must be in good contact with the electrode, otherwise an arc will be generated, and the electrode will be melted through, causing the tube to leak.

3. The electronic tube should be handled with care during packaging, storage, transportation, and replacement to avoid damage.

4. When the electron tube is working, the ventilation should be good, the surface temperature of the electron tube should not exceed 145 degrees Celsius, otherwise, the glass bulb should be blown to cool.

5. Note: When the anode dissipation power is greater than 300W, the glass bulb is blown and cooled.

 

Applications

 


 

Shipping

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Seller Guarantees

1. One year Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.

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